The Biologically Identified Optimum Temperature Interactive Console (BIOTIC) is an irrigation scheduling method developed by the USDA/ARS in Lubbock, TX. The method has been extensively tested under experimental conditions and issued a U.S. patent. A multi-year field test of BIOTIC was initiated by a research partnership in a cooperative project funded by the Oklahoma Center for the Advancement of Science and Technology. The purpose of the study is to evaluate BIOTIC in a production environment. Field studies were carried out in 1998 and 1999. In both years irrigation signals were generated almost daily during the growing season (77 of 87 days in 1998 and 72 of 86 days in 1999). The absence of significant in-season rainfall made for essentially complete reliance on irrigation. In both years the dates for which irrigations were not indicated were correlated with periods of low air temperatures. Rainfall events did not result in missed irrigation signals. In both years the system proved to be reliable, providing irrigation scheduling at least 99% of the time and was maintained in the field by non-technical personnel with minimum onsite time required.